﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Serialization;

namespace Inovout.Serialization
{
    [XmlRoot("dictionary")]

    public class SerializableDictionary<TKey, TValue> : Dictionary<TKey, TValue>, IXmlSerializable
    {
        public System.Xml.Schema.XmlSchema GetSchema()
        {

            return null;

        }



        public void ReadXml(System.Xml.XmlReader reader)
        {

            var keySerializer = new System.Xml.Serialization.XmlSerializer(typeof(TKey));

            var valueSerializer = new System.Xml.Serialization.XmlSerializer(typeof(TValue));



            bool wasEmpty = reader.IsEmptyElement;

            reader.Read();



            if (wasEmpty)

                return;



            while (reader.NodeType != System.Xml.XmlNodeType.EndElement)
            {

                reader.ReadStartElement("item");



                reader.ReadStartElement("key");

                TKey key = (TKey)keySerializer.Deserialize(reader);

                reader.ReadEndElement();



                reader.ReadStartElement("value");

                TValue value = (TValue)valueSerializer.Deserialize(reader);

                reader.ReadEndElement();



                this.Add(key, value);



                reader.ReadEndElement();

                reader.MoveToContent();

            }

            reader.ReadEndElement();

        }



        public void WriteXml(System.Xml.XmlWriter writer)
        {

            var keySerializer = new System.Xml.Serialization.XmlSerializer(typeof(TKey));

            var valueSerializer = new System.Xml.Serialization.XmlSerializer(typeof(TValue));



            foreach (TKey key in this.Keys)
            {

                writer.WriteStartElement("item");



                writer.WriteStartElement("key");

                keySerializer.Serialize(writer, key);

                writer.WriteEndElement();



                writer.WriteStartElement("value");

                TValue value = this[key];

                valueSerializer.Serialize(writer, value);

                writer.WriteEndElement();



                writer.WriteEndElement();

            }

        }
    }
}
